package com.easy.common.filter;

import com.alibaba.fastjson.JSON;
import com.easy.common.core.R;
import com.sun.prism.impl.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录过滤器
 */
@Slf4j
//@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request_ = (HttpServletRequest) request;
        HttpServletResponse response_ = (HttpServletResponse) response;
        //1、获取本次请求的URI
        String requestURI = request_.getRequestURI();
        log.info("拦截到本次请求{}", requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/login/account",
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            chain.doFilter(request_, response_);
            return;
        }
        //4、判断登录状态，如果已登录，则直接放行
        if (request_.getSession().getAttribute("username") != null) {
            log.info("用户已登录用户ID为{}", request_.getSession().getAttribute("username"));

            chain.doFilter(request_, response_);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if (request_.getSession().getAttribute("user") != null) {
            log.info("用户已登录用户ID为{}", request_.getSession().getAttribute("user"));

            chain.doFilter(request_, response_);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        response_.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配 检查本次请求是否放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) return true;
        }
        return false;
    }
}

